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  • Duplicate IP address detection with multiple NICs

    - by sfink
    I am using arping -D to detect duplicate IP addresses within a network when setting up servers. (The network is controlled by someone else, and we have had many issues with IP allocation in the past.) It works fine as long as my host has a single NIC on a given VLAN, but when my host has more than one (I have one with 9 NICs on one VLAN and 1 on the other), arping -D always returns false collisions. The problem is that all 9 of my NICs respond to an ARP request for any of the IPs on those NICs. (These are real physical NICs, not aliases or anything.) I send out one ARP request packet, and get 9 ARP is-at ARP replies, one for each MAC address. I could implement my own solution by sniffing packets and checking for any replies with a MAC address other than the local NICs', but it seems like there ought to be an easier way.

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  • What is the best/easiest way to use scripts to analyze network traffic?

    - by yungin
    I'm looking to analyze packets via scripts. I'd like to use something high level. I'm in a mac/linux environment. I'm currently looking at different python+libpcap libraries. Perhaps lua+wireshark too. Maybe tcpdump+bash (but not sure that has a lot of info i can use). I also heard good things about scapy. Not sure. I'm wondering if you have any recommendations? There's quite a few of them out there. What have you found that works best? I'd definitely want something scriptable not something that I need to compile (like c/c++, etc)

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  • Network bottleneck/throttling issue

    - by Gavin
    Hi all, It's my first day at a new company and i've been given the task to find out an issue with the internet connection. I noticed that whilst I was downloading a large file, the network grinds to a halt, except for my download. At first I thought it was the internet connection/modem but it seems that whilst the lockdown occurs, I am unable to access any network device. Has anyone experienced this before and if so, do you have any pointers? Looking at the setup. They have an DSL modem that connects to a 10/100 switch. There are only 5-6 computers on the network. Cheers Gavin

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  • How can I stream audio signals from various devices/computers to my home server?

    - by Breakthrough
    I currently have a headless home server set up (running Ubuntu 12.04 server edition) running a simple Apache HTTP server. The server is near an audio receiver, which controls a set of indoor and outdoor speakers in my home. Recently, my father purchased a Bluetooth adapter, which our various laptops and cellphones can connect to, outputting the music to the speakers. I was hoping to find a solution that worked over Wi-Fi, namely because it won't cost anything (I already have a server with an audio card), and it doesn't depend on Bluetooth. Is there any cross-platform (preferably free and open-source) solution that I can use which will allow me to stream audio to my home server, over my home network, from a wide variety of devices (laptops running Windows/Linux or cellphones running Android/BB/iOS)? I need something that works at least with Windows and Android. Also, just to clairfy, I want something that simply allows devices to connect to my server and output an audio signal without any action on the server end (since it's a server hidden away near my receiver). Any subsequent connection attempt should be dropped, so only one device can be in control of the stereo at once.

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  • VM can’t connect to outside in bridged mode

    - by Kamal
    Hi Guys, I am not able to ping any machine(not even the host) from Guest VM in bridged mode. But I got an IP which is on the same subnet as host. I can ping my guest VM from the host and can use ssh to connect to the guest. I am using Vmware workstation 6.5. Guest VM is a centos VM and host is windows xp. Every thing works fine in NAT mode. Any clues as to what could be happening. I tried disabling all the firewalls I have. My virtual network editor shows that my ethernet adapter(the one my host uses) is used for bridging. It is connected. I don't understand how I can get an IP address from DHCP server. I can't ping any of the DNS servers in generated /etc/resolv.conf which are the same as that of my host

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  • Why can I not access the internet when Windows 7 finds no issue with the ethernet connection and the network can see my device?

    - by WannabeCoder
    So I just moved from a house to an apartment. In the house and the apartment I had Uverse set up - and in both I had my desktop connected via a ~40 foot long cat5 cable. However, upon moving to the apartment I found that my ethernet connection no longer provides internet. This would seem like a mundane problem if not for: The router can see the computer on the network Windows 7 (the desktop's OS) detects no problems with the ethernet connection. Connections over the internet (i.e. browser windows, Pandora, etc.) do not immediately fail. Instead they load for 2 minutes and then finally give up. Devices connected over the Wifi (PS4, Laptop) access the internet just fine While removing the cat5 cable from my house, I accidentally damaged the locking tab but managed to bend it back into the appropriate position. I would suspect that a bad cat5 cable might be to blame if not for the above issues (thought I've heard bad cat5 cables cause the most nonsensical problems) and the fact that I tested the cat5 cable by having it share internet between my laptop (working internet) to my desktop and it functioned just fine and provided the desktop with internet. My ipconfig /all successfully finds a default gateway, DHCP server, and DNS server. What could possibly be causing the problem?

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  • Iomega Home Media Network Hard Drive: Accesing the data in the disk?

    - by JJarava
    Hi all! I have an Iomega Home Media Network Hard Drive, 1TB, and lately I can't access the data on the drive. The shares (both built-in and created by me) are there, the security works, but when trying to access the data I get a "The network path was not found" message which is worrying, to say the least. I'd like to know if there is a way to get the data off the disks somehow, as some of the data in the drive (ie, pictures and videos of my 1.5 yrs old son) is hard if not impossible to find otherwise. Thanks a lot Javier

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  • windows server 2008r2 with terminal services in multiple networks with different users

    - by phhe
    is there a way to let terminal services make some kind of 'abstraction' over the physical network interfaces of the server so they can be managed via gpo to grant or prohibit access for different users? the basic idea is to have 2 network interfaces (user and server/management) and not letting users within terminal sessions access the server/management network. or is this just impossible ? what would be a better way to do this ?

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  • How to redirect all Internet traffic to OpenVPN Server

    - by JuliaS
    I have seen working solutions around the issue of forcing Internet traffic to go through the OpenVPN server but they are all done in Linux, all I want to know is how to add an entry to the route table in windows to make this happen. connectivity between the client and server is fine, my Windows 7 client can establish a connection to the Windows 2008 Server, but when established Internet traffic is still going from the local Windows 7 machine. Here are the details: Server: Windows 2008 Server with one NIC OpenVPN IP Address: 192.168.0.1 Local NIC IP Address (connects the server to the Internet): 10.242.69.107 Client: Windows 7 with one NIC OpenVPN IP Address: 192.168.0.2 ISP allocated IP Address: 10.0.8.2 (gateway 10.0.8.1) Server OpenVPN Config: dev tun ifconfig 192.168.0.1 192.168.0.2 secret static.key push "redirect-gateway def1" Client OpenVPN Config: remote xxx.xxx.com dev tun ifconfig 192.168.0.2 192.168.0.1 secret static.key I'm not an expert with adding routes...etc. I would be grateful if someone could let me know how to add this entry in my server/client route table. EDIT: Output from the client's netstat -rnv IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 10.0.8.1 10.0.8.2 20 10.0.8.0 255.255.255.252 On-link 10.0.8.2 276 10.0.8.2 255.255.255.255 On-link 10.0.8.2 276 10.0.8.3 255.255.255.255 On-link 10.0.8.2 276 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 192.168.0.0 255.255.255.252 On-link 192.168.0.2 286 192.168.0.2 255.255.255.255 On-link 192.168.0.2 286 192.168.0.3 255.255.255.255 On-link 192.168.0.2 286 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 10.0.8.2 276 224.0.0.0 240.0.0.0 On-link 192.168.0.2 286 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 255.255.255.255 255.255.255.255 On-link 10.0.8.2 276 255.255.255.255 255.255.255.255 On-link 192.168.0.2 286 ===========================================================================

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  • setup Mac Book Wifi interface as Wifi hotspot using specific DHCP option

    - by srjohnhuang
    I want to using my Mac Book as an access point. Besides that I also need to configure its DHCP server to not provide DNS info. For example, Mac Books AP's ssid is "MacBookHotspot". While my iPhone connected to "MacBookHotspot", I want the Wifi info displayed my iPhone would be looked like: IP ADDRESS DHCP(tab) IP Address 192.168.0.1 Subnet Mask 255.255.255.0 Router 192.168.0.254 DNS Search Domains Client ID (key point: DNS filed is blank) Does anyone have any good suggestion? Thanks!

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  • Network is going down once per day

    - by Charly
    Once per day the network on eth0 is going down and we need to do sudo ifdown eth0; sudo ifup eth0 to get the network up. Here is the syslog: Feb 11 12:48:01 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 12:52:35 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 12:56:23 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:00:28 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:04:29 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:09:16 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:13:53 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:18:16 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:22:25 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:26:52 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:30:44 www-tech-1 dhclient: DHCPREQUEST of address> on eth0 to 131.121.113.228 port 67 Feb 11 13:31:49 www-tech-1 dhclient: There is already a pid file /var/run/dhclient.eth0.pid with pid 3198 Feb 11 13:31:49 www-tech-1 dhclient: Listening on LPF/eth0/00:e0:81:49:fc:e0 Feb 11 13:31:49 www-tech-1 dhclient: Sending on LPF/eth0/00:e0:81:49:fc:e0 Feb 11 13:31:49 www-tech-1 dhclient: DHCPRELEASE on eth0 to 131.121.113.228 port 67 Feb 11 13:31:49 www-tech-1 dhclient: There is already a pid file /var/run/dhclient.eth0.pid with pid 134519072 Feb 11 13:31:50 www-tech-1 dhclient: Listening on LPF/eth0/00:e0:81:49:fc:e0 Feb 11 13:31:50 www-tech-1 dhclient: Sending on LPF/eth0/00:e0:81:49:fc:e0 Feb 11 13:31:52 www-tech-1 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8 Feb 11 13:31:52 www-tech-1 dhclient: DHCPREQUEST of 131.121.14.17 on eth0 to 255.255.255.255 port 67 Feb 11 13:31:53 www-tech-1 kernel: [265383.991682] eth0: no IPv6 routers present Please check the last portion of this syslog. Can anybody help me?

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  • How do I see what connections are being made?

    - by Coldblackice
    My DDWRT router is showing that my computer has a connection count around 600! The router is at 100% CPU use. How can I see what's making all the connections? So far, I've opened up Resource Monitor and checked the network tab. I can sort by which program is using the most network bandwidth (Pale Moon browser), but I can't see what's making all of the connections. Or rather, where all the connections are being toward (trying to find what tab must be making all of these connections). I've also tried netstat -A, but it apparently doesn't show the actual number of connections being made. At least, the list of established connections isn't very long, by any means (like enough to account for the 500+ connections apparently being made.

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  • Using Juniper EX3300 as a router

    - by Richard Whitman
    So I have a Juniper EX3300 Switch. One of its uplink ports (ge-0/1/0) is connected to my ISP's router. ISP router's port address is xx.xx.xx.109. My switch's IP address is xx.xx.xx.110. From the switch, I can ping to xx.xx.xx.109 and any other IP in the world. I mean its connected to the Internet. I connected the port eth0 of a computer (running Ubuntu) to the port ge-0/0/0 of the switch (which in the same VLAN as ge-0/1/0). I configured the port eth0 as follows: iface eth0 inet static address yy.yy.yy.208 netmask 255.255.255.240 gateway xx.xx.xx.110 yy.yy.yy.208 is assigned to me by the ISP. So, now I can ping to the switch (xx.xx.xx.110) from this computer. But I can not ping to either xx.xx.xx.109 (ISP router) or any other IP. I want this computer to be connected to the Internet. What am I doing wrong? Here are some of the configurations on my switch: interfaces { ge-0/0/0 { unit 0 { family ethernet-switching; } } . . . ge-0/1/0 { ether-options { no-auto-negotiation; link-mode full-duplex; speed { 1g; } } unit 0 { family ethernet-switching { port-mode access; } } } . . . vlan { unit 0 { family inet { address 10.0.1.1/24; } } unit 1 { family inet { address xx.xx.xx.110/30; } } } } . . . routing-options { static { route 0.0.0.0/0 { next-hop xx.xx.xx.109; retain; } } } vlans { Cogent { vlan-id 3; interface { ge-0/1/0.0; ge-0/0/0.0; ge-0/0/1.0; ge-0/0/2.0; ge-0/0/3.0; } l3-interface vlan.1; } TFLan { vlan-id 2; interface { ge-0/0/5.0; ge-0/0/6.0; ge-0/0/7.0; ge-0/0/8.0; ge-0/0/9.0; ge-0/0/10.0; ge-0/0/11.0; ge-0/0/12.0; ge-0/0/13.0; ge-0/0/14.0; ge-0/0/15.0; ge-0/0/16.0; ge-0/0/17.0; ge-0/0/18.0; ge-0/0/19.0; ge-0/0/20.0; ge-0/0/21.0; ge-0/0/22.0; ge-0/0/23.0; ge-0/0/4.0; } l3-interface vlan.0; } }

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  • DNS Settings in Cisco Wireless Lan Controllers

    - by Braden
    The WLC is a 2100 series and I have looked back and forth through the entire web interface. Originally the idea was that the gateway should be the DNS controler and the WLC pointed directly at the gateway. For some reason, random clients are having DNS specific issues when it comes to seeing certain shares around the network. The problems are also very intermittent. Aside from going to each box and implementing a static DNS is there ACTUALLY a DNS setting lodged into the WLC settings (and I am being a numpty and can't find them) or am I stuck with performing the config 1 by 1?

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  • No communication on my VLAN?

    - by Donovan
    I am using a Netgear FSM7328S switch and have designated ports 19-24 as being part of VLAN # 3. I designated them all as untagged because I do not want them to switch traffic to any other port on the switch. I also removed them from the default, untagged, VLAN 1. My issue is that none of the ports 19-24 will communicate with eachother. My laptop plugged in with wireshark shows no switched traffic what so ever. Have I configured it wrong? Thanks, D

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  • How to force certain traffic through GRE tunnel?

    - by wew
    Here's what I do. Server (public internet is 222.x.x.x): echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf sysctl -p iptunnel add gre1 mode gre local 222.x.x.x remote 115.x.x.x ttl 255 ip add add 192.168.168.1/30 dev gre1 ip link set gre1 up iptables -t nat -A POSTROUTING -s 192.168.168.0/30 -j SNAT --to-source 222.x.x.x iptables -t nat -A PREROUTING -d 222.x.x.x -j DNAT --to-destination 192.168.168.2 Client (public internet is 115.x.x.x): iptunnel add gre1 mode gre local 115.x.x.x remote 222.x.x.x ttl 255 ip add add 192.168.168.2/30 dev gre1 ip link set gre1 up echo '100 tunnel' >> /etc/iproute2/rt_tables ip rule add from 192.168.168.0/30 table tunnel ip route add default via 192.168.168.1 table tunnel Until here, all seems going right. But then 1st question, how to use GRE tunnel as a default route? Client computer is still using 115.x.x.x interface as default. 2nd question, how to force only ICMP traffic to go through tunnel, and everything else go default interface? I try doing this in client computer: ip rule add fwmark 200 table tunnel iptables -t mangle -A OUTPUT -p udp -j MARK --set-mark 200 But after doing this, my ping program will timeout (if I not doing 2 command above, and using ping -I gre1 ip instead, it will works). Later I want to do something else also, like only UDP port 53 through tunnel, etc. 3rd question, in client computer, I force one mysql program to listen on gre1 interface 192.168.168.2. In client computer, there's also one more public interface (IP 114.x.x.x)... How to forward traffic properly using iptables and route so mysql also respond a request coming from this 114.x.x.x public interface?

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  • How to detect VPN disconnection with vpnc?

    - by Abhinav
    What is the easiest way to detect that a vpnc connection on Linux/Ubuntu has disconnected? Manually, I think the way to detect is to check whether the interface (tun0) appears in /sbin/ifconfig output. Is there a better way to find out immediately, so that a script can be run to restart the connection?

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  • ZigBee Maximum Bandwidth

    - by Kris
    What is the maximum rated bandwidth for ZigBee? I can't seem to find this information anywhere, not even on the ZigBee Alliance website at http://www.zigbee.org/ I did find some information elsewhere, but it dated back to 2004, so I'm guessing it's different now that it was 5 years ago. Thanks!

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  • Linksys WRT54G2 not showing connected PC's in DHCP table

    - by Moose
    For some reason all of a sudden my linksys WRT54G2 no longer shows PC's connected in the DHCP table. It was being touchy then all of a sudden they all just disappeared. It showed 2 of the 4 connected then it showed the other 2 then it only showed 1 and then it was showing none. I seem to be having a connection reset every 30-60 minutes also not sure if that is related to the router going bad or if it is just comcast being it's typical crappy self. I have tried to reset my router and my cable modem and both problems still seem to keep happening(no PC's in table and connection reset every 30-60 mins). Now I know the router doesn't store clients after a router reboot but they normally show up within a matter of minutes for me in the past. Before anyone asks yes all devices on the network are using DHCP and not static. Could this be a sign of the router starting to go bad?

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  • How to connect the virtual networks of vmware guests running on different hosts?

    - by gyrolf
    In a test setup, we are running several virtual machines on a single vmware workstation host. All virtual machines are connected via a "host only" network. This runs fine up to 2 or 3 virtual machines (depending on the host hardware). To allow more virtual machines, we want to use more host machines. Details about the environment and applications: Host PCs are running Windows XP in a corporate intranet. VMware used is Workstation 6.5 Guests are running Windows Server 2003 All guests act as Web Servers One of the guests additionally acts as Windows File server, offering shared folders for the other guests to connect to. Restrictions: VMware guests shall not be visible from the intranet. Changes to the host PC are restricted by corporate policy. In the virtual network, no domain controller exists. All virtual machines are member of the same workgroup. Running the virtual network as NAT is possible. Port forwarding might be used if it does not conflict with ports used by the host PC. Looking for a solution, I found hints about using router or vpn software on the hosts, but without any details how to setup. (I found a similar question Sharing the network between 2 VMware hosts, but the answer was not sufficient for me.)

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  • NIC interface names in /proc/interrupts

    - by Gallus
    When I look at /proc/interrupts: $ cat /proc/interrupts CPU0 CPU1 (...) 12: 4 0 IO-APIC-edge i8042 14: 145 65310875 IO-APIC-edge ide0 50: 0 0 IO-APIC-level uhci_hcd:usb5, Intel ICH7 58: 5388 7983508 IO-APIC-level libata 169: 812427252 1236572641 IO-APIC-level skge, eth1 217: 6 0 IO-APIC-level ehci_hcd:usb1, uhci_hcd:usb2 225: 0 0 IO-APIC-level uhci_hcd:usb3 233: 60 3108720778 IO-APIC-level uhci_hcd:usb4, skge I can see two skge and one eth1 entries. All of them are the network cards. Because of the general name "skge" (which is the name of the network driver of the card) I can't easily reocognize, which NIC occupies which interrupt. How to make linux use more descriptive names in the entries? Or: Is there any alternative way to obtain INT information instead of /proc/interrupt? My final goal is to manipulate smp_affinities of the NICs.

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  • Slow transfer speed between two servers

    - by Linux Guy
    I have two servers both network cards speed is 10Gbps The inbound bandwidth between two servers is 10Gbps , the outbound bandwidth internet bandwidth is 500Mpbs Both servers using public ip addresses in public and private network Both servers transfer and connection on nginx port , and the server B used for streaming media , like youtube stream videos I check the transfer speed using iperf utility From Server A to Server B # iperf -c 0.0.0.1 -p 8777 ------------------------------------------------------------ Client connecting to 0.0.0.1, TCP port 8777 TCP window size: 85.3 KByte (default) ------------------------------------------------------------ [ 3] local 0.0.0.0 port 38895 connected with 0.0.0.1 port 8777 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.8 sec 528 KBytes 399 Kbits/sec My Current Connections in Server B # netstat -an|grep ":8777"|awk '/tcp/ {print $6}'|sort -nr| uniq -c 2072 TIME_WAIT 28 SYN_RECV 1 LISTEN 189 LAST_ACK 139 FIN_WAIT2 373 FIN_WAIT1 3381 ESTABLISHED 34 CLOSING Server A Network Card Information Settings for eth0: Supported ports: [ TP ] Supported link modes: 100baseT/Full 1000baseT/Full 10000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Advertised link modes: 10000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Speed: 10000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 0 Transceiver: external Auto-negotiation: on MDI-X: Unknown Supports Wake-on: d Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: yes Server B Network Card Information Settings for eth2: Supported ports: [ FIBRE ] Supported link modes: 10000baseT/Full Supported pause frame use: No Supports auto-negotiation: No Advertised link modes: 10000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: No Speed: 10000Mb/s Duplex: Full Port: Direct Attach Copper PHYAD: 0 Transceiver: external Auto-negotiation: off Supports Wake-on: d Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: yes The problem is : as you can see from iperf utility, the transfer speed from server A to server B slow when i restart network service the connection will be ok , after 2 minutes , it's getting slow How could i troubleshoot slow speed issue and fix it in server B ? Notice : if there any other commands i should execute in servers for more information, so it might help resolve the problem , let me know in comments

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